In a first, scientists detect radio signal sent from 9 billion Light-Years Away from Earth

or the first time, a radio signal sent from a galaxy, which is almost 9 billion light-years away from the Earth, has been captured, media reports said on Friday. What is special about this signal is that it has a unique wavelength, which is known as a "21-centimeter line" or the "hydrogen line." It is reportedly emitted by neutral hydrogen atoms. In a first, scientists detect radio signal sent from 9 billion Light-Years Away from Earth